<Yes.>
What's the best order to do this in - he doesn't want to open with the plan itself, Kastil will tell him absolutely not and then he'll have to arrest his top investigator and the fact that he has the power to do this in no way means that he's happy about the prospect.
<I'm not sure anything I say can change your mind, since your hypothesis here is mind-control, but - I'll say some of my considerations. I think we're relatively unlikely to be in the worst-case-scenario world – where Caris is a cultist of Asmodeus, Asmodeus can actually reach us here, and Carissa's powers include arbitrary mind-control rather than...nonmagical skills like being very persuasive and good at lying and controlling his thoughts, which I won't deny he is. If we're in that scenario I think we've already lost, and it doesn't matter what we do.>
<Caris might have been a cultist of Asmodeus, but the magic is arcane wizardry and Asmodeus can't reach us, which seems more likely because I suspect Asmodeus would have already conquered us, and not politely. And in that case, honestly, I have no idea why anyone would keep worshipping him - it's one thing when you're in his country under his power and have no choice, but once you've escaped his control...> Shrug. <We can break that down into, either he has undetectable arbitrary mind-control or he doesn't. I think he probably doesn't, or he would have avoided nearly being captured. Caris without access to Asmodeus and with only some mind-control is probably someone we can beat.>
<I think you've been putting a lot of weight on the claim that Caris is working with our gods, who are opposed to the Eastern Empire. I don't think so. Partly for illegible gut feelings that I don't expect you to take seriously in the slightest, but - he wants to save Altarrin. He's willing to take on some risk to himself, to do that – er, I'll get to that in a moment, I'm not done, but point is, I don't think he wanted Altarrin dead.>
Sigh. This is the hardest part.
<I'm worried this could be a godplot in the opposite direction. If I start from the premise that neither I nor Altarrin were mind-controlled – skillfully finessed, maybe, I'm not claiming Caris is honest, but not directly altered – then it looks an awful lot like Vkandis took Altarrin down, and then found a way to leverage that into having us take Caris down for him. I think it's - a very plausible alternate story - that the gods want Caris dead for exactly the reasons they want Altarrin dead, because he's disruptive and ambitious.>
<And, sure, maybe he wants to take over the Empire. But I think we can work with that, if he's not serving any gods and I'm currently at least 90% confident he isn't. Half of my ministers would betray me and take my place if they saw an opening and their compulsions let them think about it.>
<...I know your job is to prevent threats from the gods, and nothing else. I know why that takes someone as paranoid as you. You've done it admirably. But - as Emperor, it's not only my job to hold off the gods. I also need to be able to see, and take, opportunities that will help the Empire flourish. Even if I'm not certain, and it's a gamble. ...I wouldn't consider it if it was a binary choice between "Caris is genuinely entirely on Altarrin's side" and "Caris is the puppet of a torture god" but I think most of the bad scenarios are - less all-or-nothing than that. And it's worth taking some measured risk to get information.>
He lets out his breath.
<Tell me what considerations I'm missing. Actual facts or logical steps I forgot to include, I mean, not just - weighting the risks and the benefits differently>